Broken hardware in Network Solutions’ domain name system led to 120,000 websites being down for over an hour earlier this week.
The problem affected a piece of hardware that handled domain name requests. A DNS platform routes internet visitors to an appropriate web server by translating the domain name into a corresponding server’s IP address.
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Although Network Solutions is believed to have had a back-up system in place to tackle network failures, it didn’t prevent Monday's hardware failure taking down the 120,000 domains hosted by the company.
In October, tens of thousands of websites were also temporarily unreachable, when two US-based ISPs, Level 3 Communications and Cogent Communications, had a dispute over the cost of access arrangements when customer data shared their underlying internet infrastructure.
The dispute prompted analyst group Gartner to warn users to make enquiries about how their ISPs intended to support their data, and to consider having a back-up ISP in place.
Gartner said every location requiring mission-critical internet connectivity, including externally hosted websites, should be multi-homed.
It said firms must buy connectivity through at least two ISPs, and ensure that the second ISP was not simply a customer of the first.